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Continuous monitoring of  220 Rn- and  222 Rn-activities above and below the soil surface combined with sporadic direct  222 Rn-flux measurements is used to quantify diffusive trace gas transport in the air-filled pore space of soil, through the soil-atmosphere interface and in the lowest layers of the atmosphere. In a calm night,  222 Rn-activities above the surface first build-up near the ground ( z &lt;10 cm) and subsequently with a delay of 2-3 hours at higher altitudes ( z &lt;5 m). Knowing (1) the  222 Rn-flux from activity profiles measured in soil gas, (2) from direct flux determinations and (3) using information about atmospheric diffusion parameters from  220 Rn-activities measured near the surface it is possible to model the temporal evolution of the vertical  222 Rn-profiles in a night with stable weather and constant soil conditions. The system operates automatically for extended periods of time in the field enabling a better understanding of transport processes in response to changing environmental conditions (wind, rain, soil humidity).

Continuous on-line calibration of diffusive soil-atmosphere trace gas transport using vertical 220 Rn- and 222 Rn-activity profiles